Also bear in mind that while higher Ah batteries run longer, they also take longer to recharge.īestReviews Home Improvement and DIY Expert Other factors to consider Manufacturers tend to quote figures taken under “ideal conditions,” so we’d be a little more conservative. Run times and recharge times will have a big impact if you need to work consistently. If you’re not expecting it, that can be a disappointing discovery. Often, you’ll get a 4Ah “primary” battery, which is great, but the second might only be 1.5Ah. Be careful, though: sometimes both are 2Ah, which we would look at as a practical minimum. The best come with two batteries, so you can keep working with one while the other recharges. They deliver peak performance for longer, which is what you want, and then run flat relatively abruptly.īetter-quality tools come with a higher Ah battery to extend performance - perhaps 4Ah or 5Ah. Modern lithium-ion (Li-ion) batteries don’t suffer the gradual drop-off in power that you get from nickel cadmium (Ni-cad). In essence, the higher the Ah rating, the longer the tool will deliver full power. It’s definitely not an indication of how long the tool will run before it needs recharging. In the real world, that doesn’t really mean much. Technically, that means the battery will supply a consistent 1 amp for 1.5 hours. The minimum battery size on these tools is usually 1.5Ah. More correctly called amp hours (Ah), amps tell you how long power can be maintained. These compete with corded models, and they’re the professional option. They’re often quite compact, making them easy to use.ġ8V or 20V drills are the most powerful models currently available. It will cope with small tasks, but it won’t have the power to drill into concrete or brick.ġ2V drill/drivers are common and are good all-arounders. With a budget drill set, you might only get an 8V drill/driver. VoltsĪ volt measures the amount of power available. Volts and amps often cause some confusion, but they are important aspects of your drill or power tool purchase, so let’s clarify. BestReviews Home Improvement and DIY Expert Voltage and amps
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